The hall of Supreme Harmony Ⅲ

There are 72 pillars surporting the whole palace. Six of them are carved with dragon designs and gilded with gold encircled the throne. 

On top of six pillars is a cassion ceiling with a Xuanyuan Mirror hanging in the middle. The XuanYuan Mirror is said to be created by Emper XuanYuan (also know as Emperor Huangdi ) in ancient times. 

The emperor had this mirror hung here in order to show that he was the legitimate emperor. And the mirror was placed just over the throne.

However, the mirror is not right over the throne. It is said that Yuanshikai was afraid that the mirror might drop and injure him. So he had it moved a little bit to the present site.